A Man And His Reinforced Glass

[Karmac]

Using R-Glass to create sentry gunshields is a confirmed bug, has never been meant to work as a feature and is classed as an 'exploit', do not attempt to recreate these from the images you may have seen me post as you are technically abusing the game mechanic where bullets spawn a tile in front of the gun shooting them.

[Surrealistik]

Beware the fun police